Display screen or portion thereof with a transitional graphical user interface



A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all other copyright rights whatsoever. The following notice applies to the drawing that forms a part of this document: Copyright © 2011 Adobe Systems Inc. All rights reserved.

FIG. 1 is the first image in a sequence for a display screen or portion thereof with a transitional graphical user interface according to the first embodiment; and

FIG. 2 is the second image thereof.

FIG. 3 is the first image in a sequence for a display screen or portion thereof with a transitional graphical user interface according to the second embodiment; and

FIG. 4 is the second image thereof.

FIG. 5 is the first image in a sequence for a display screen or portion thereof with a transitional graphical user interface according to the third embodiment; and,

FIG. 6 is the second image thereof.

The broken lines illustrate portions of a display screen, graphical user interface, and environmental structure for the display screen or portion thereof with a transitional graphical user interface that forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with a transitional graphical user interface, as shown and described. 